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Fri, 5 Dec 2025 13:45:43 +0000 (GMT) From: Narayana Murty N To: mahesh@linux.ibm.com, maddy@linux.ibm.com, mpe@ellerman.id.au, christophe.leroy@csgroup.eu, gregkh@linuxfoundation.org, oohall@gmail.com, npiggin@gmail.com Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, tyreld@linux.ibm.com, vaibhav@linux.ibm.com, sbhat@linux.ibm.com, ganeshgr@linux.ibm.com, sourabhjain@linux.ibm.com Subject: [PATCH 2/4] powerpc/pseries: Add RTAS error injection buffer infrastructure Date: Fri, 5 Dec 2025 03:45:08 -0600 Message-ID: <20251205094510.4671-3-nnmlinux@linux.ibm.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251205094510.4671-1-nnmlinux@linux.ibm.com> References: <20251205094510.4671-1-nnmlinux@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: CQ-PqF0qz3S83R9RwFT7O3wn5tTosToV X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTI5MDAwOCBTYWx0ZWRfXz+GOrvrsJlDF YhITCdRbyIyPItDeDoJBKaUgGSBei3zNW2GZB/f3pWC6CJZemrLn+kjJKnTVkA+1SU7JaRrFpuK s3b0B8+IDzEAg8T59KivO1mpmJ7bh/3u49SUg9WGAW+YYaeHytQmOZ1Ictmgsy2Tn98Tmcqcte1 86fyYLS1aMa4L8WTisiGe81wMIQ4ymaR+6O/wCTCnVjfpVTJWiaGRmVK7ap0V+ljwL2xYfazZDn eFs4qLVQb3hukDtVBVNeIcpo7cqbFjewH1abVt1jKBQUUdSiPs2tsw5dJS1qHHiEufvVyoDqSNk xJJ1jHvoRJQlQspQvBxr3MgeEfVAX4KY5vo4hfbm9cDUdozJg1BxKlMpBII/D1p4i4Kekc8w8PD 7pMuyStGUoCrzEb1AqZhitE2oYhrww== X-Authority-Analysis: v=2.4 cv=Scz6t/Ru c=1 sm=1 tr=0 ts=6932e210 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=wGYcmt_NxZN9edKSF48A:9 X-Proofpoint-GUID: -Pml54njcR_e1BWp5AlaayyP0uGCVYKv X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-05_04,2025-12-04_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 adultscore=0 clxscore=1015 spamscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511290008 Adds global infrastructure required by the injection engine: - a 1KB aligned RTAS working buffer in rtas.c - a spinlock to serialize buffer access - UAPI definitions for error-injection tokens (added to eeh.h) Signed-off-by: Narayana Murty N --- arch/powerpc/include/asm/rtas.h | 21 +++++++++++++++++++++ arch/powerpc/include/uapi/asm/eeh.h | 18 ++++++++++++++++++ arch/powerpc/kernel/rtas.c | 12 ++++++++++++ 3 files changed, 51 insertions(+) diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h index d046bbd5017d..82512f822c7a 100644 --- a/arch/powerpc/include/asm/rtas.h +++ b/arch/powerpc/include/asm/rtas.h @@ -519,6 +519,27 @@ int rtas_get_error_log_max(void); extern spinlock_t rtas_data_buf_lock; extern char rtas_data_buf[RTAS_DATA_BUF_SIZE]; +/* + * RTAS Error Injection Buffer (PAPR-compliant) + * ============================================ + * + * 1KB aligned, zero-initialized buffer for ibm,errinjct RTAS work area. + * Protected by rtas_errinjct_buf_lock for concurrent access safety. + * + * PAPR Requirement: ibm,errinjct requires a caller-allocated buffer passed + * via physical address. Buffer must accommodate largest error type layouts: + * - IOA bus error (64-bit): 8x32-bit words (32 bytes) + * - All other types: <=4x32-bit words (16 bytes) + * + * Usage: + * prepare_errinjct_buffer() -> spin_lock() -> rtas_call() -> spin_unlock() + * + * Alignment: SZ_1K ensures PAPR firmware requirements and cache-line safety. + */ +#define RTAS_ERRINJCT_BUF_SIZE 1024 +extern spinlock_t rtas_errinjct_buf_lock; +extern char rtas_errinjct_buf[RTAS_ERRINJCT_BUF_SIZE]; + /* RMO buffer reserved for user-space RTAS use */ extern unsigned long rtas_rmo_buf; diff --git a/arch/powerpc/include/uapi/asm/eeh.h b/arch/powerpc/include/uapi/asm/eeh.h index 3b5c47ff3fc4..86645cab2827 100644 --- a/arch/powerpc/include/uapi/asm/eeh.h +++ b/arch/powerpc/include/uapi/asm/eeh.h @@ -41,4 +41,22 @@ #define EEH_ERR_FUNC_DMA_WR_TARGET 19 #define EEH_ERR_FUNC_MAX 19 +/* RTAS PCI Error Injection Token Types */ +#define RTAS_ERR_TYPE_FATAL 0x1 +#define RTAS_ERR_TYPE_RECOVERED_RANDOM_EVENT 0x2 +#define RTAS_ERR_TYPE_RECOVERED_SPECIAL_EVENT 0x3 +#define RTAS_ERR_TYPE_CORRUPTED_PAGE 0x4 +#define RTAS_ERR_TYPE_CORRUPTED_SLB 0x5 +#define RTAS_ERR_TYPE_TRANSLATOR_FAILURE 0x6 +#define RTAS_ERR_TYPE_IOA_BUS_ERROR 0x7 +#define RTAS_ERR_TYPE_PLATFORM_SPECIFIC 0x8 +#define RTAS_ERR_TYPE_CORRUPTED_DCACHE_START 0x9 +#define RTAS_ERR_TYPE_CORRUPTED_DCACHE_END 0xA +#define RTAS_ERR_TYPE_CORRUPTED_ICACHE_START 0xB +#define RTAS_ERR_TYPE_CORRUPTED_ICACHE_END 0xC +#define RTAS_ERR_TYPE_CORRUPTED_TLB_START 0xD +#define RTAS_ERR_TYPE_CORRUPTED_TLB_END 0xE +#define RTAS_ERR_TYPE_IOA_BUS_ERROR_64 0xF +#define RTAS_ERR_TYPE_UPSTREAM_IO_ERROR 0x10 + #endif /* _ASM_POWERPC_EEH_H */ diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index 04c8438aadda..ae1cd7964bae 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -769,6 +769,18 @@ EXPORT_SYMBOL_GPL(rtas_data_buf); unsigned long rtas_rmo_buf; +/* + * RTAS Error Injection Buffer - Global Definitions + * Global 1KB buffer and spinlock for ibm,errinjct RTAS service. + * Exported for pseries EEH error injection usage. + */ + +DEFINE_SPINLOCK(rtas_errinjct_buf_lock); +EXPORT_SYMBOL_GPL(rtas_errinjct_buf_lock); + +char rtas_errinjct_buf[1024] __aligned(SZ_1K); +EXPORT_SYMBOL_GPL(rtas_errinjct_buf); + /* * If non-NULL, this gets called when the kernel terminates. * This is done like this so rtas_flash can be a module. -- 2.51.1